Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Engine Cooling System
ELC Condition (Contamination and Inhibitor Concentration)
Perform a visual inspection of the ELC. It should have no
cloudiness or floating debris. Determine the chemical
inhibitor concentration level by using an ELC-specific test
kit or test strips. Inhibitor concentration level determines
corrosion protection. If you are concerned about possible
coolant quality, contamination, or mechanical problems,
submit a coolant sample for analysis. Improper maintenance
may cause coolant degradation and could result in
damage to the cooling system and engine components.
Consult your dealer or the ELC manufacturer’s representative
for recommended ELC test kits, test strips, and laboratory
sample procedures.
ELC Extender
Add ELC extender if necessary at the maintenance interval
under “Cooling” on page 183.
Preventive Maintenance
Topping Off
WARNING! Removing the fill cap on a hot
engine can cause scalding coolant to spray
out and burn you badly. If the engine has been
in operation within the previous 30 minutes,
be very careful in removing the fill cap. Protect
face, hands, and arms against escaping
fluid and steam by covering the cap with a
large, thick rag. Do not try to remove it until
the surge tank cools down if you see any
steam or coolant escaping. In any situation,
remove the cap very slowly and carefully. Be
ready to back off if any steam or coolant
begins to escape.
NOTE: If frequent topping off is necessary and
there are no visible signs of coolant leaks when
the engine is cold, check for leaks with the engine
operating at normal temperature.
WARNING! Handle coolant and antifreeze carefully.
Ethylene glycol antifreeze is poisonous
and can cause death or personal injury. Store in
original fluid container only and always keep out
of reach of children.
– 180 – Y53-6027 Medium Duty (R05/09)